Ventilating and filtering device for underground coal mine

Abstract

The utility model provides an underground coal mine ventilation filtering device, which relates to the field of coal mines, and comprises an induced draft fan and an air gathering cover communicated with the inlet end of the induced draft fan, two groups of filtering plates working alternately are inserted in the air gathering cover in a sliding manner, and one side of the air gathering cover is connected and communicated with a back flushing cover. The filter plate is slidably clamped in the back-blowing cover, the outlet end of the induced draft fan is connected with and penetrates through a back-blowing pipe, and the back-blowing pipe extends into the back-blowing cover. According to the underground coal mine ventilation and filtration device, air is introduced from the interior of the air gathering cover through the induced draft fan and filtered through the filter plates, and impurities such as filtered batting and leaves can be left on the surfaces of the filter plates and alternately enter the interior of the back flushing cover through the two filter plates; and a reverse blowing pipe is introduced through the outlet end of the induced draft fan to perform reverse blowing on the filter plate, so that impurities on the surface of the filter plate can be blown into the dirt storage tank to be collected.

Description

Technical Field

[0001] This utility model relates to the field of coal mining technology, specifically to a ventilation and filtration device for underground coal mines. Background Technology

[0002] During tunnel excavation, ventilation is necessary to provide breathing space for personnel and to remove and dilute harmful gases and dust generated after gas blasting or other explosions at the working face. Due to factors such as ground temperature, it is also necessary to regulate the harsh underground climate conditions. The basic tasks of mine ventilation are to supply sufficient fresh air to meet the oxygen needs of personnel; to dilute and remove toxic and harmful gases and dust to ensure safe production; to regulate the underground climate to create a good working environment; and to improve the mine's disaster resistance capabilities.

[0003] A coal mine ventilation device for easy dust filtration disclosed in Chinese invention patent CN215170144U includes a ventilation pipe with an inlet and an outlet connected to its left and right ends, respectively. A filter plate is fixedly connected inside the left end of the ventilation pipe, and a dual-axis motor is installed in the middle part of the right end of the ventilation pipe. The left and right output ends of the dual-axis motor are fixedly connected to rotating shafts, and a transmission shaft is rotatably connected to the middle part of the filter plate.

[0004] This coal mine ventilation device, designed for easy dust filtration, utilizes a dual-shaft motor, filter plates, rotating plates, lightweight springs, scrapers, and rotating fan blades to ventilate coal mine construction sites and filter dust. The rotating fan blades effectively ventilate and exchange air within the mine, while the filter plates filter dust. The scraper's rotation, driven by the rotating plate, prevents the filter plates from clogging. However, impurities scraped off by the scraper directly enter a connected collection box. Within the collection box, impurities are easily re-adsorbed onto the filter plates due to the negative pressure created by the rotating fan blades. Utility Model Content

[0005] To address the shortcomings of existing technologies, this utility model provides a ventilation and filtration device for underground coal mines, which solves the problem mentioned in the background technology that impurities easily flow back and adhere to the filter plate.

[0006] Technical solution

[0007] To achieve the above objectives, this utility model is implemented through the following technical solution: a ventilation and filtration device for underground coal mines, comprising an induced draft fan and an air-gathering hood connected to the inlet end of the induced draft fan. Two sets of alternately working filter plates are slidably inserted inside the air-gathering hood. A back-blowing hood is connected and penetrated on one side of the air-gathering hood. The filter plates are slidably engaged inside the back-blowing hood. A back-blowing pipe is connected and penetrated at the outlet end of the induced draft fan. The back-blowing pipe extends into the interior of the back-blowing hood. A sludge collection tank is connected and penetrated on one side of the back-blowing hood. A baffle is elastically rotatably connected to the connection end of the sludge collection tank and the back-blowing hood. An exhaust hole is opened on the side wall of the sludge collection tank. A telescopic sleeve is fixedly installed at one end of the air-gathering hood. The free end of the telescopic sleeve is fixedly connected to the filter plate.

[0008] Furthermore, the backflush pipe is fixedly installed inside the backflush hood with a connecting cavity, and the top of the connecting cavity is connected to and passes through multiple sets of backflush nozzles.

[0009] Furthermore, a diverter is provided between the backflush pipe and the connecting cavity. One output end of the diverter is connected to and passes through an extension pipe. A control valve is fixedly installed in the middle of the extension pipe. A fixing frame is provided on the outer surface of the backflush nozzle. The fixing frame is connected to and passes through the backflush hood through an airbag. A return spring is sleeved on the outer surface of the airbag. The return spring is fixedly connected to the fixing frame and the backflush hood respectively. The extension pipe is connected to and passes through the airbag. An exhaust hole is opened in the extension pipe between the control valve and the airbag. The diverter and the connecting cavity are connected and pass through each other through a telescopic hose.

[0010] Furthermore, a telescopic slide rod is installed below the fixed frame. The input end of the telescopic slide rod is connected and penetrates the control of the distributor. The free end of the telescopic slide rod is fixedly connected to the communicating cavity. The fixed part of the telescopic slide rod has an exhaust port. The free part and the fixed part of the telescopic slide rod are fixedly connected by a tension spring.

[0011] Furthermore, there are multiple airbags, which are divided into left and right groups. The left and right groups of airbags are connected and communicate with each other through an air supply chamber, which is connected and communicates with an extension tube.

[0012] The beneficial effects of this utility model are as follows:

[0013] 1. This underground ventilation and filtration device for coal mines introduces air from inside the air collection hood through an induced draft fan and filters the air through filter plates. Impurities such as lint and leaves can remain on the surface of the filter plates and enter the interior of the back-blowing hood through two filter plates alternately. The back-blowing pipe is introduced through the outlet end of the induced draft fan to back-blow the filter plates, thereby blowing the impurities on the surface of the filter plates into the sludge collection box for collection.

[0014] 2. This underground ventilation and filtration device for coal mines utilizes a diverter to direct some air into an airbag due to the height difference between two filter plates. This causes the airbag to expand, allowing the back-blowing nozzle to rise and approach the higher filter plate, thus enabling close-range back-blowing. After back-blowing is complete, the control valve is closed, and the gas inside the airbag is discharged through the exhaust port under the action of the return spring. The back-blowing nozzle then returns to its original position, resulting in better cleaning of the filter plates. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the structure of this utility model;

[0016] Figure 2 This is a half-sectional schematic diagram of the air-collecting cover of this utility model;

[0017] Figure 3 This is a half-sectional schematic diagram of the sludge storage box of this utility model;

[0018] Figure 4 This is a schematic diagram of the internal mechanism of the backflush hood of this utility model;

[0019] Figure 5 This is a schematic diagram of the connection of the shunt of this utility model.

[0020] In the diagram: 1. Exhaust fan; 2. Air collection hood; 3. Filter plate; 4. Backflush hood; 5. Backflush pipe; 6. Sludge tank; 7. Baffle; 8. Exhaust port; 9. Telescopic sleeve; 10. Diverter; 11. Extension pipe; 12. Control valve; 13. Fixing frame; 14. Airbag; 15. Return spring; 16. Exhaust port; 17. Telescopic hose; 18. Telescopic slide rod; 19. Exhaust outlet; 20. Tension spring; 21. Air supply chamber; 22. Connecting chamber; 23. Backflush nozzle. Detailed Implementation

[0021] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0022] See Figure 1-5A ventilation and filtration device for underground coal mines includes an induced draft fan 1 and an air-collecting hood 2 connected to the inlet end of the induced draft fan 1. Two sets of alternately working filter plates 3 are slidably inserted inside the air-collecting hood 2. A back-blowing hood 4 is connected and penetrated on one side of the air-collecting hood 2. The filter plates 3 are slidably snapped into the inside of the back-blowing hood 4. A back-blowing pipe 5 is connected and penetrated at the outlet end of the induced draft fan 1. The back-blowing pipe 5 extends into the inside of the back-blowing hood 4. A sludge collection tank 6 is connected and penetrated on one side of the back-blowing hood 4. A baffle 7 is elastically rotatably connected to the connection end of the sludge collection tank 6 and the back-blowing hood 4. An exhaust hole 8 is opened on the side wall of the sludge collection tank 6. A telescopic sleeve 9 is fixedly installed at one end of the air-collecting hood 2. The free end of the telescopic sleeve 9 is fixedly connected to the filter plates 3. With this setting, the filter plates 3, after working for a certain period of time, can be inserted into the back-blowing hood 4 for back-blowing, thereby cleaning the filter plates 3.

[0023] The backflush pipe 5 is fixedly installed inside the backflush hood 4 with a connecting cavity 22. The top of the connecting cavity 22 is connected to and passes through multiple sets of backflush nozzles 23. This arrangement enables the airflow to be distributed more evenly, thereby providing a better cleaning effect.

[0024] A diverter 10 is provided between the backflush pipe 5 and the connecting cavity 22. One output end of the diverter 10 is connected to and passes through an extension pipe 11. A control valve 12 is fixedly installed in the middle of the extension pipe 11. A fixing frame 13 is provided on the outer surface of the backflush nozzle 23. The fixing frame 13 is connected to and passes through the backflush cover 4 through an airbag 14. A return spring 15 is sleeved on the outer surface of the airbag 14. The return spring 15 is fixedly connected to the fixing frame 13 and the backflush cover 4 respectively. The extension pipe 11 is connected to and passes through the airbag 14. An exhaust hole 16 is opened in the extension pipe 11 between the control valve 12 and the airbag 14. The diverter 10 and the connecting cavity 22 are connected and pass through a telescopic hose 17. With this arrangement, the backflush nozzle 23 can be raised and lowered to adapt to the filter plates 3 of different heights, so that it can closely adhere to the filter plates 3 for backflush.

[0025] A telescopic slide rod 18 is installed below the fixed frame 13. The input end of the telescopic slide rod 18 is connected to and passes through the diverter 10. A proportional valve is connected in the middle. The free end of the telescopic slide rod 18 is fixedly connected to the connecting cavity 22. The fixed part of the telescopic slide rod 18 has an exhaust port 19. The free part and the fixed part of the telescopic slide rod 18 are fixedly connected by a tension spring 20. Since there is a gap between the adjacent back-blowing nozzles 23, the gap position can also be back-blown by moving the back-blowing nozzles 23, so that the cleaning can be more thorough.

[0026] There are multiple airbags 14, which are divided into left and right groups. The left and right groups of airbags 14 are connected and communicate with each other through the air supply chamber 21. The air supply chamber 21 is connected and communicates with the extension tube 11. This arrangement can ensure the stability of the movement of the fixed frame 13.

[0027] In use, air is introduced from inside the air collection hood 2 by the blower 1 and filtered through the filter plate 3. The filtered lint, leaves and other impurities remain on the surface of the filter plate 3. The two filter plates 3 alternately enter the inside of the back-blowing hood 4, and the back-blowing pipe 5 is introduced through the outlet end of the blower 1 to back-blow the filter plates 3, thereby blowing the impurities on the surface of the filter plates 3 into the sludge collection box 6 for collection.

[0028] During the backflushing process, due to the height difference between the two filter plates 3, some air is introduced into the airbag 14 through the diverter 10, causing the airbag 14 to unfold. The backflushing nozzle 23 can be raised to approach the filter plate 3 at the higher position, thus achieving close-range backflushing. After the backflushing is completed, the control valve 12 is closed, and under the action of the return spring 15, the gas in the airbag 14 is discharged through the exhaust port 16, and the backflushing nozzle 23 is reset.

[0029] Because there are gaps between the multiple backflush nozzles 23, by venting the telescopic slide rod 18 and cooperating with the exhaust port 19 to exhaust, the telescopic slide rod 18 extends when the air supply is greater than the exhaust volume, and retracts when the exhaust volume is greater than the air supply volume, thereby enabling the backflush nozzles 23 to move back and forth within a small range.

[0030] It should be noted that in this paper, relational terms such as first and second are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations.

[0031] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the technical scope disclosed in the present utility model, based on the technical solution and the inventive concept of the present utility model, should be included within the protection scope of the present utility model.

Claims

1. A ventilation and filtration device for underground coal mines, comprising an induced draft fan (1) and an air-collecting hood (2) connected to the inlet end of the induced draft fan (1), wherein two sets of alternately operating filter plates (3) are slidably inserted inside the air-collecting hood (2), characterized in that: One side of the air-collecting hood (2) is connected to and penetrates the back-blowing hood (4), the filter plate (3) is slidably snapped into the inside of the back-blowing hood (4), the outlet end of the blower (1) is connected to and penetrates the back-blowing pipe (5), and the back-blowing pipe (5) extends into the inside of the back-blowing hood (4). A sludge storage tank (6) is connected to and passes through one side of the back-blowing hood (4). A baffle (7) is elastically rotatably connected to the connection end of the sludge storage tank (6) and the back-blowing hood (4). An exhaust hole (8) is opened on the side wall of the sludge storage tank (6). One end of the air hood (2) is fixedly installed with a telescopic sleeve (9), and the free end of the telescopic sleeve (9) is fixedly connected to the filter plate (3).

2. The underground ventilation and filtration device for coal mines according to claim 1, characterized in that: The backflush pipe (5) is fixedly installed inside the backflush hood (4) with a connecting cavity (22). The top of the connecting cavity (22) is connected to and passes through multiple sets of backflush nozzles (23).

3. The underground ventilation and filtration device for coal mines according to claim 2, characterized in that: A diverter (10) is provided between the backflush pipe (5) and the connecting cavity (22). One output end of the diverter (10) is connected to and passes through an extension pipe (11). A control valve (12) is fixedly installed in the middle of the extension pipe (11). A fixing frame (13) is provided on the outer surface of the backflush nozzle (23). The fixing frame (13) is connected to and passes through the backflush cover (4) through an airbag (14). A return spring (15) is sleeved on the outer surface of the airbag (14). The return spring (15) is fixedly connected to the fixing frame (13) and the backflush cover (4) respectively. The extension pipe (11) is connected to and passes through the airbag (14). An exhaust hole (16) is opened between the control valve (12) and the airbag (14) in the extension pipe (11). The diverter (10) and the connecting cavity (22) are connected and pass through a telescopic hose (17).

4. The underground ventilation and filtration device for coal mines according to claim 3, characterized in that: A telescopic slide rod (18) is installed below the fixed frame (13). The input end of the telescopic slide rod (18) is controlled and connected to the distributor (10). The free end of the telescopic slide rod (18) is fixedly connected to the connecting cavity (22). The fixed part of the telescopic slide rod (18) is provided with an exhaust port (19). The free part and the fixed part of the telescopic slide rod (18) are fixedly connected by a tension spring (20).

5. A coal mine underground ventilation and filtration device according to claim 4, characterized in that: The number of airbags (14) is multiple, and the multiple airbags (14) are divided into left and right groups. The left and right groups of airbags (14) are connected and communicate with each other through the air supply chamber (21). The air supply chamber (21) is connected and communicates with the extension tube (11).

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